Letter | Published:

Spin directions of interfering beams in quantum interferometry

Nature volume 294, pages 544546 (10 December 1981) | Download Citation

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Abstract

It is shown here that, in a fermion interferometer experiment, the notion of the relative orientation of the interfering beams can be given a sensible meaning—information may be extracted about the spin directions without destroying the interference pattern. This is done on a gedanken-experiment level by introducing into, say, a neutron interferometer Stern–Gerlach magnets with detectors placed into their respective ‘down’-spin beam paths. Similar considerations apply to experiments where spinor behaviour has been demonstrated in systems with higher spin.

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Author notes

    • A. Zeilinger

    Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Affiliations

  1. Atominstitut der Österreichischen Universitäten, A-1020 Wien, Austria

    • A. Zeilinger

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DOI

https://doi.org/10.1038/294544a0

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